Lab Microcontroladores

PRACTICA 9

PWM Y ADC

OBJETIVOS:

• Familiarizarse con el manejo del PWM y del convertidor digital analógico ADC

Proyectos:

MANEJO DEL PWM

/*

* Nombre del Proyecto:

P9a_pwm.c

* Nombre del Autor:

(c) Mikroelektronika, 2009.

* Description:

(Explicación del ejercicio)

* Test configuration:

MCU: PIC16F887

Oscillator: HS, 08.0000 MHz

SW: mikroC PRO for PIC

* NOTES:

*/

unsigned short current_duty, old_duty, current_duty1, old_duty1;

void InitMain() {

ANSEL = 0; // Configure AN pins as digital

ANSELH = 0;

C1ON_bit = 0; // Disable comparators

C2ON_bit = 0;

PORTA = 255;

TRISA = 255; // configure PORTA pins as input

PORTB = 0; // set PORTB to 0

TRISB = 0; // designate PORTB pins as output

PORTC = 0; // set PORTC to 0

TRISC = 0; // designate PORTC pins as output

PWM1_Init(5000); // Initialize PWM1 module at 5KHz

PWM2_Init(5000); // Initialize PWM2 module at 5KHz

}

void main() {

InitMain();

current_duty = 16; // initial value for current_duty

current_duty1 = 16; // initial value for current_duty1

PWM1_Start(); // start PWM1

PWM2_Start(); // start PWM2

PWM1_Set_Duty(current_duty); // Set current duty for PWM1

PWM2_Set_Duty(current_duty1); // Set current duty for PWM2

while (1) { // endless loop

if (RA0_bit) { // button on RA0 pressed

Delay_ms(40);

current_duty++; // increment current_duty

PWM1_Set_Duty(current_duty);

}

if (RA1_bit) { // button on RA1 pressed

Delay_ms(40);

current_duty--; // decrement current_duty

PWM1_Set_Duty(current_duty);

}

...